The second plant may be a Bacopa. There is a plant called Creeping Charlie that may or may not be a true aquatic but the leaf structure is not quite the same. There is a thread here from 2010 in fact on this Creeping Charlie, here:
From the leaf structure I'm more inclined to think the photo is a Bacopa, which does grow in a creeping manner so this may account for the common name used by the store or their supplier. Hate common names, no one knows what one is talking about.
The first photo I agree with fishmonger, likely Lilaeopsis or microsword. The photo shows it a bit more compact than one would expect Helanthium tenellum [sometimes still seen as Echinodorus tenellus, the pygmy chain sword] to be. Pulling it apart out of the pot and rock wool might help to ID it, the Lilaeopsis is very compact but the H. tenellum is quite distinctively a separate plant with runners. We had some photos of all these in a thread recently, here it is: